Montana bullets – The ExhaustNotes Blog

By Joe Berk

You’ll recall a recent blog where I waxed eloquent about Eleanor, my Ruger RSM .416 Rigby rifle. In that blog, I talked about reduced loads using 350-grain cast Montana bullets and 5744 and Trail Boss propellant. It was fun…the Trail Boss loads had milder recoil and “good enough” (but not stellar) accuracy. Take a look at these 50-yard targets:

The above target on the left was with 30.0 grains of Trail Boss; the one on the right was with 34.0 grains of Trail Boss. I could feel a tiny bit more recoil with the 34.0-grain load, but both were light loads with modest recoil. Weirdly, the point of impact shifted sharply to the right with the lighter load, but it moved back to the center with the 34.0-grain load (and it was slightly higher). The Trail Boss loads shot okay, but they weren’t running in the same league as the load I had shot the prior week with 5744 propellant and the same Montana Bullet Works 350-grain bullet, as you can see from the 50-yard targets below.

I could see what I was getting with the Trail Boss and I could see that it wasn’t grouping nearly as well as the 5744 loads at 50 yards, so that stopped my testing with Trail Boss (that, and the fact that I had used up all my Trail Boss cartridges).

I was curious: How would Eleanor do at 100 yards? I still had some of the 5744 loads left, so I posted a couple of 100-yard targets and let Eleanor have her way. I first fired a 3-shot group and after looking through my spotting scope, I was surprised to see how well they grouped.

I thought maybe that target was a random success, and I didn’t want to ruin it by throwing more shots at it. So I fired another 3-shot group at the second target, and then another three at that same target. That’s the one you see below.

Before all you keyboard commandos start telling me that these results are nothing special, allow me to point out that these are 100-yard groups using open sights on an elephant rifle. I’m calling it good to go. Like I said earlier, when the elephants become an invasive species here in So Cal, I’m ready. The load is 45.0 grains of 5744 (it’s the load the Lyman Cast Bullet Handbook specified as the accuracy load, and they were right), the 350-grain Montana Bullet Works .416 bullet sized to .417 and crimped in the cannelure, Hornady brass, and a CCI-200 primer. I didn’t weigh each charge; I just adjusted my RCBS powder dispenser and cranked them out. If you were wondering, I use Lyman dies for this cartridge.

A bit more about Eleanor: The rifle is a Ruger 77 that the good folks from New Hampshire call an Express or RSM model (I think RSM stood for Ruger Safari Magnum). They made them in 375 H&H, 416 Rigby, and 458 Lott (kind of a magnum .458 Magnum). Ruger also made a similar one in a few of the standard calibers (7mm Mag, 30 06, and 300 Win Mag, and maybe one or two others). These rifles were a bit pricey when Ruger sold them in the late 1990s/early 2000s, but evidently not pricey enough. They were too expensive to manufacture, so Ruger stopped making them. When you see these rifles come up for sale today (which doesn’t happen very often), they command a premium. I wish I had bought one in 30 06 when they were first offered; to me, that would be the perfect rifle.

The rear sight on a Ruger RSM rifle is of the African “Express” style. The elevation adjustment consists of a fixed and two flip-up blades, and they all have a very shallow V. I guess the idea of that shallow V is that it lets you see more in case an elephant is charging. The sight has two flip up blades behind the fixed blade; as range increases, you flip up the second blade, and if it is an even longer shot, you go for the third blade. I got lucky, for me, the fixed rear sight blade is perfect with this load. I made a minor adjustment for windage, and the elevation is spot on with a 6:00 hold at both 50 yards and 100 yards.

Incidentally, that rib the rear sight sits on? It’s not a separate piece. It and the barrel were turned and milled from one solid piece of steel. It’s one of the reasons these rifles were too expensive to manufacture.

The front sight is the typical brass bead (you can sort of see it in the featured photo at the top of this blog), which I usually don’t like, but with these results I can’t complain. I’ve shot better groups with two or three other open sight rifles using jacketed bullets at 100 yards; this is the best any cast bullet has ever done for me.

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Want to see the first installment of the Eleanor story? It’s right here.

Check out our other guns and reloading articles here.

Tough to get to a gunstore to buy targets? Range fees for targets too high? Do what I do and order them online. They’re delivered right to your door and they’re less expensive, too.

Need a calipers for measuring your group size? This is a great place to find great calipers at a great price.

Want to check out Montana Bullets? Here’s a link to their website. Tell them Joe sent you. Trust me on this: These are best cast bullets I’ve ever used.

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This is an interesting story and it’s one of the very few times in my life I was hosed on a firearm purchase. The rifle is a 1903 Springfield I bought a few years ago and didn’t shoot much. The times I shot it previously I had experimented with cast bullets and it shot okay, but not great. Then I tried it with jacketed bullets (loads at much higher pressures), and what do you know, I had a headspace issue. I could see it in the primers that had partially backed out of the brass after firing, and on one round, I split a case circumferentially just ahead of the base (indicating with near certainty an excess head space issue). I borrowed good buddy Greg’s 30 06 head space gages, and the bolt closed on both the no go and the field service gages. That’s a no no.

The 1903 Springfield rear sight. The 1903A3 went to a much less expensive stamped steel rear aperture sight.

My first thought was to have the existing barrel set back and rechambered, but that didn’t work. The 1903 Springfield has a barrel collar that holds a very sophisticated rear sight and positions the upper handguard. When we set the barrel back, the rear sight integrity was greatly weakened and the front handguard had excess play. Nope, I needed a new barrel.

I checked around and came to the conclusion that the best place to get this kind of work done is the Civilian Marksmanship Program (CMP) Custom Gunshop. This is a quasi-government arsenal and these folks are the experts. I priced having a new barrel and rear sight collar installed on my 1903, cutting a new 30 06 chamber with the correct headspace, and having the entire gun re-Parkerized. The work was surprisingly reasonable. I had to wait my turn in line, but that’s okay. I had other guns I could shoot.

With a re-Parkerized finish and a new barrel, my 1903 looks great.

Very cool. The 1903 “scant” stock, complete with cartouche.

When the rifle was returned to me, it was stunning. It literally looked like a brand new 1903. A quick trip to the range followed, and I tried some jacketed bullet factory level reloads. I loaded and fed from the magazine, as the 1903 is a controlled round feed and it’s best in these guns to let the cartridge rim ride up and find its position behind the extractor.

A 30 06 cartridge in the 1903’s magazine.

I shot a few targets with copper jacketed bullets and found that the rifle shot about a 8 inches high and slightly to the right. The rear sight would take care of the right bias, and I figured the high impacts were okay. Some military rifles of this era are designed with a 300-yard battlesight zero, which means they shoot to point of aim at 300 yards at the lowest sight setting (everything in between is high, with the idea being that if you hold center-of-mass on a human size target, you’ll have a hit out to 400 or 500 yards).

High and slightly to the right with factory-level reloads. My point of aim was 6:00 on the orange bullseye.

I could buy a taller front sight blade to lower the point of impact, but that wasn’t the way I wanted to go. Nope, my plan was to shoot cast bullets in this rifle. My guess was that if the rifle shot 8 inches high at 50 yards with jacketed bullets, cast bullets would be right where I wanted them to be.

Loading my first batch of 1903 cast bullet test ammo was easy. Years ago I was on a reloading tear, and I had loaded a bunch of plated 110-grain round nose bullets with 14.0 grains of Unique. I knew those loads were terrible in other 30 06 rifles (the lead under the copper plating is dead soft and it tears off, resulting in terrible accuracy). Hey, no problem. I pulled the plated bullets, left the 14.0 grains of Unique in the cartridges, flared the case mouths, and seated different cast bullets. One was the 180-grain cast Hursman bullets with gas checks (these worked well in the .300 Weatherby), the other was the 210-grain Montana bullets I picked up from good buddy Paul (these are also gas checked bullets). After seating the cast bullets, I crimped the brass with my Lee factory crimp die.

The Lee factory crimp die. It’s shown here with a jacketed bullet. It has collets that circumferentially crimp the case mouth to the bullet.

30 06 reloads with cast bullets. That’s the Montana bullet on the upper cartridge, and the Hursman bullet in the lower cartridge. If you look closely, you can see that the case mouth has been crimped by the Lee factory crimp die.

A macro shot of the Hursman 180 grain bullet. The case was crimped with a Lee factory crimp die.

A similar photo of the Montana bullet. It’s cast with a Lyman mold. The Montana bullet’s rounded nose fed better from the 1903 magazine.

I only loaded 20 rounds (10 each with the two different cast bullets), as this was to be a “quick look” evaluation.

A morning at the range on an overcast day, a beautiful 1903 Springfield rifle, and .30 06 ammo loaded with cast bullets. Life doesn’t get much better.

Both loads shot reasonably well. I’m not going into the upholstery business with either of these loads (they are not tack drivers), but they are good enough. I was particularly pleased with the 210-grain Montana bullets. The Hursman bullets had proved to be the preferred load in the .300 Weatherby; the Springfield showed a decided preference for the Montana bullets.

I shot at 50 yards with both loads; future testing will be with the Montana bullet at 100 yards.

The Hursman bullet load at 50 yards. The load was 14.0 grains of Unique; it may be that the Hursman bullets will group better with other propellants.

The Montana bullet at 50 yards on the left-most bullseye (the other bullseyes were shot with a Mosin-Nagnt rifle, covered in another blog). I found a sweet spot with that 14.0-grain Unique load and the Montana bullet.

Unique is not the best powder out there for loading cast bullets in rifle cartridges. In the past, I’ve shot much better groups in other rifles with IMR 4227, 5744, SR 4759, and Trail Boss. Those evaluations in the 1903 are coming up. For now, I know I’ve got a good load with Unique and the Montana bullets.

One of the big takeaways for me in this adventure is that when you buy a milsurp rifle, always check the headspace to make sure that it is within specification. It’s pretty common for these rifles to have gone through arsenal rebuilds and to have been cobbled together from parts bins, and when that occurs, if the chamber isn’t matched to the bolt you can have an excess headspace problem. That’s a bad situation, as it can be dangerous to the shooter and anyone nearby.

You can find headspace gages on Amazon and elsewhere. If you’re going to buy a military surplus rifle, checking the headspace should be part of the drill.

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